subdue vs squelch

subdue is not a noun while squelch is a noun.

Word	Noun	Adjective	Verb	Adverb
subdue	No	No	Yes	No
squelch	Yes	No	Yes	No

As verbs, squelch is a hyponym of subdue; that is, squelch is a word with a more specific, narrower meaning than subdue:

subdue (noun)	squelch (noun)
	an electric circuit that cuts off a receiver when the signal becomes weaker than the noise
	a crushing remark

subdue (verb)	squelch (verb)
correct by punishment or discipline	suppress or crush completely
bring under control by force or authority	to compress with violence, out of natural shape or condition
make subordinate, dependent, or subservient	walk through mud or mire
get on top of; deal with successfully	make a sucking sound
hold within limits and control
put down by force or intimidation